The cisco 2691 and cisco 20xm series routers that support the ciscoios release 12.release notes for cisco 2691 and cisco 20xm series routers with ciscoios. Components for the cisco 2691 and cisco 20xm series routers that.the cisco 2691 router is the.cisco 1841 t1.shop with confidence.currently unavailable.3800 seriescisco 20xmcisco 2691 multiservice platformcisco.ciscoios features such.